task 4.c
#include<stdio.h> int main(){ int i,k=0; char ch; FILE*fp; fp = fopen("data4.txt","r");; if(fp == NULL){ printf("fail to open file\n"); return 1; } ch = fgetc(fp); while(ch != EOF){ putchar(ch); ch = fgetc(fp); } fclose(fp); printf("data4.txt中共包含字符数(不计空白符):%d\n",k); return 0; }
写不出来。。。。
task5.c
#include <stdio.h> #include <string.h> #include <stdlib.h> #define N 10 typedef struct { long int id; char name[20]; float objective; // 客观题得分 float subjective; // 操作题得分 float sum; char level[10]; } STU; // 函数声明 void input(STU s[], int n); void output(STU s[], int n); void process(STU s[], int n); int main() { STU stu[N]; printf("从文件读入%d个考生信息: 准考证号,姓名,客观题得分(<=40),操作题得分(<=60)\n", N); input(stu, N); printf("\n对考生信息进行处理: 计算总分,确定等级\n"); process(stu, N); printf("\n打印考生完整信息, 并保存到文件中"); output(stu, N); return 0; } // 从文本文件examinee.txt读入考生信息:准考证号,姓名,客观题得分,操作题得分 void input(STU s[], int n) { int i; FILE *fin; fin = fopen("examinee.txt", "r"); if (fin == NULL) { printf("fail to open file\n"); exit(0); } while (!feof(fin)) { for (i = 0; i < n; i++) fscanf(fin, "%ld %s %f %f", &s[i].id, s[i].name, &s[i].objective, &s[i].subjective); } fclose(fin); } // 输出考生完整信息: 准考证号,姓名,客观题得分,操作题得分,总分,等级 // 不仅输出到屏幕上,还写到文本文件result.txt中 void output(STU s[], int n) { FILE *fout; int i; // 输出到屏幕 printf("\n"); printf("准考证号\t姓名\t客观题得分\t操作题得分\t总分\t\t等级\n"); for (i = 0; i < n; i++) printf("%ld\t\t%s\t%.2f\t\t%.2f\t\t%.2f\t\t%s\n", s[i].id, s[i].name, s[i].objective, s[i].subjective, s[i].sum, s[i].level); // 保存到文件 fout = fopen("result.txt", "w"); if (!fout) { printf("fail to open or create result.txt\n"); exit(0); } fprintf(fout, "准考证号\t\t姓名\t客观题得分\t操作题得分\t总分\t\t等级\n"); for (i = 0; i < n; i++) fprintf(fout, "%ld\t\t%s\t%.2f\t\t%.2f\t\t%.2f\t\t%s\n", s[i].id, s[i].name, s[i].objective, s[i].subjective, s[i].sum, s[i].level); fclose(fout); } // 对考生信息进行处理:计算总分,排序,确定等级 void process(STU s[], int n) { int i,j; STU t; for(i = 0;i<n;i++){ s[i].sum=s[i].objective+s[i].subjective;} for(i=0;i<n-1;i++) for(j=0;j<n-1-i;j++) if(s[j].sum<s[j+1].sum) { t = s[j]; s[j]=s[j+1]; s[j+1]=t;} for(i=0;i<n;i++){ if(i==0) strcpy(s[i].level,"优秀"); else if(i<=4&&i>0) strcpy(s[i].level,"良好"); else strcpy(s[i].level,"不合格");} }
task6.c
#include<stdio.h> #include<stdlib.h> #include<time.h> #define N 80 typedef struct{ long int id; char name[80]; char classname[80]; }STU; //函数声明 void input(STU s[],int n); void process(STU s[], int n); int main(){ STU stu[N]; input(stu, N); process(stu, N); return 0; } void input(STU s[],int n){ int i; FILE *fin; fin = fopen("list.txt","r"); if(fin == NULL){ printf("fail to open file\n"); exit(0); } while(!feof(fin)){ for(i = 0; i< n;i++){ fscanf(fin,"%ld %s %s",&s[i].id,s[i].name,s[i].classname);} } fclose(fin); } void process(STU s[],int n){ srand(time(NULL)); int b[5]; int i=0; for(i=0;i<5;i++){ b[i]=rand()% 80 + 1; } for(i=0;i<5;i++) { printf("%ld\t%s\t%s\n",s[b[i]].id,s[b[i]].name,s[b[i]].classname);} FILE *fout; //保存到文件 fout = fopen("lucky.txt","w"); if(!fout){ printf("fail to open or creat lucky.txt\n"); exit(0); } for(i=0;i<5;i++) fprintf(fout,"%ld\t%s\t%s\n",s[b[i]].id,s[b[i]].name,s[b[i]].classname); fclose(fout); }
标签:fp,int,void,STU,实验,include,fin From: https://www.cnblogs.com/zy250106/p/17471508.html